The invention relates to a surface vertical shaft retort (100) heated by an external source, which includes (i) a multifunctional central pipe (110), (ii) a top sealing device (120), (iii) a load distribution system (130), (iv) a retorting vessel (140) containing an annular-shaped bed (141) furnished with a set of load pipes (142), spaced among themselves, to form a collecting chamber to gather gas and mist (143), a hot gas injector (144), a cold recycle collector (145) and distributor (146) and a bed control and unloading mechanism (147), (v) a plenun chamber (150) (vi) a device for heat recovery of the spent shale (160) containing a piping network (162) for recirculation and spraying of the retorting water and accumulation hoppers (161) and (vii) a device for dry bottom sealing (170). In addition, this patent application comprises a process to obtain oil and gas from pyro-bituminous oil shale and/or materials which contain organic compounds using the referred surface vertical retort (100) heated by an external source through the following steps (a) load supply, (b) sealing of the load supply, (c) load distribution, (d) gathering and removal of gases and mist, (e) heating and drying of the load, (f) reinjection of the cold-gas recycle stream from stage (i), (g) load pyrolysis, (h) injection of the hot-gas recycle stream, (i) removal of the cold-gas recycle stream, (j) heat recovery from the spent shale, (k) discharge of the annular-shaped bed, (l) cold-gas recycle injection (m) mixture of the cold recycle stream with water vapor stream, (n) collection in the accumulation hoppers of discharged spent material, (o) spraying of the recycled retorting water, (p) water vapor generation by the contact of the recycled retorting water with the retorted material deposited in the accumulation hoppers and (q) dry discharge of the spent shale , and bottom sealing.
Nowadays, considering the global population, which exceeds seven billion people, an accelerated mobility to more advantaged social classes and greater offer of products that consume energy, there is an increase in the demand for fossil fuels, triggering a price raise and/or causing shortage of such commodity, leading to a substantial economic impact worldwide.
There is a wide range of ways to obtain the energy required to meet the global energy demand. However, despite the advances in the development of new technologies to produce energy from different sources, such as renewable sources, oil is still the main source used, especially due to its importance as a transportation fuel, and it is not likely to be replaced by another source.
Oil is an energy source with universal reach, which has been in large use for more than a century. However, a decline in its production capacity, as well as an increase in its price, is already noticeable.
Easily accessible oil land fields, which allow low cost and environmentally-safe production of oil, have been facing production declines and new findings have become rare. There are, nevertheless, continental platforms where findings increasingly occur, especially in deep waters and, in many cases, such as in Brazil, under a thick layer of salt.
There are significant technological challenges and high costs to access such reserves and, consequently, produce oil, and reduce possible environmental impacts.
Pyro-bituminous oil shale, a type of ore nearly available in the entire planet, which contains kerogen, a hydrocarbon which displays a long chain of carbons, is deposited in equivalent or even superior potential reserves in comparison to those existing now in the form of liquid oil. This ore has great potential to fulfill the additional demands for liquid hydrocarbon in the worldwide energy matrix.
It is understood that researchers have been dedicated to develop new processes in order to obtain hydrocarbon from pyro-bituminous oil shale, creating processes linked to the oil shale physicochemical properties, which are different for each of the oil shale deposits (VOLKOV, E. and STELMAKH, G. The stages of research on creating commercial units for processing the oil shale fines. Oil Shale. A Scientific-Technical Journal (Estonian Academy Publishers) 16 (2): 161-185, 1999).
Most of these processes have only gone as far as the experimental stage in laboratories. A few others have achieved subsequent stages, such as the development of pilot units, prototypes and semi-industrial stages. Nonetheless, most of them were later abandoned because they posed technical and/or economic problems which could not be overcome.
Currently there are only a few processes in developmental and/or in industrial scale production stage.
In general, the process to obtain hydrocarbon from pyro-bituminous oil shale occurs through a process of pyrolysis of the rock, basic principle of all processes. The kerogen, organic matter that originates oil and gas, is found, in solid form, inside the mineral matrix of the rock. When the ore is heated to a specific temperature, the molecule of kerogen is decomposed (fragmented into chains with smaller numbers of carbons), forming a mixture of hydrocarbons and others gases.
The existing processes worldwide may be classified into two main categories: processes that are performed on the surface and those which are performed in the subsurface, also known as in situ.
The subsurface processes (in situ), despite being based on the premise of eliminating mining and ore processing, thereby reducing costs with these activities and with the recovery of the mined area, do not reach economically viable levels. The greatest difficulty found by the in situ processes is related to heat transfer, which impacts the control of the process and the use of oil/gas existing in the deposit, and, as a result, reduces the deposit exploitation. Also, in relation to the environment, in situ processes present a high potential of groundwater contamination by oil, gas and chemical products used to open slits in the oil shale layer which cannot be fully removed from the retorting site.
In the surface processes, oil shale needs to be previously mined, crushed and classified to meet the range of particle size requested by the particular process which it will undergo. All these operations and their related operations (dust and noise suppression, mined area recovery, etc.) contribute towards an increase of the final cost of the produced oil.
The surface processes can also be classified according to the range of the particle size of the material to be processed. Therefore, there are processes that operate with fine materials (particles), usually below 10 mm, and processes that operate with granular material, generally between 10 mm and 75 mm.
The surface processes that operate on the base of a fine grain size are normally performed in horizontal retorts (reactors) or with small rotational inclination, similar to calcination kilns in the cement industry. These processes generally use the burning of the spent shale inside the retort as a source of heat, which can be complemented by an external source to the retort such as the burning of a portion of the pyrolysis products or by the return of the ashes from the combustion of the spent shale performed externally.
On the other hand, processes which do not require a complementary source of heat are typically used in deposits which present oil shale with high level of organic matter in the form of ligneous and kerogen.
Fluidized bed reactors have been tested recently. They use the recirculation gas technique and require the load to be in a much finer particle size, generally less than 2 mm. No promising data have yet been shown regarding this process, though.
The processes performed with fine particle size generally produce high density and high viscosity oil, which displays a high level of fine particles in the produced oil, making it difficult to filter, and presenting a lower yield factor in comparison to the processes operated with granular materials.
As an example of a process that operates with oil shale fines, there is the retorting process Galoter, from Estonia, capable to process 3,000 tons per day on a horizontal rotational retort, similar to a clinker furnace that operates with an oil shale particle size below 25 mm. The Galoter process has a yield around 75% in oil on the standard Fischer assay, and is considered complex and of difficult operation (QIAN J. and WANG J. World Oil Shale Retorting Technologies—China Petroleum University—Beijing 100101 China, 2006). The improved version of the Galoter process, named EnefiT process, uses the heat from the ashes of the burned oil shale for pyrolysis, adding new peripheral equipment and making it more complex and difficult to operate.
Also, the retorting process ATP (Alberta Taciuk Process), developed by UMATAC Industrial Processes, which was originally developed to process tar sands and was, subsequently, adapted to process pyro-bituminous oil shale, uses a horizontal rotational retort and operates with oil shale with a particle size below 25 mm. The process has a yield around 85% in oil on the standard Fischer assay.
For information purposes, other processes which operate with fine particles, such as Tosco II, Lurgi-Ruhrgas, Oil Tech, Chevron STP (fluidized bed), Shell Spher (fluidized bed) and Kentort H (fluidized bed),were operated only to the pilot stage or are currently discontinued due to various technical problems.
The retorting processes that operate with granular material generally use fixed vertical retorts (reactors), i.e. non-rotational ones, containing various load sealing systems, several constructions of retorting vessels to perform the pyrolysis stage and different retorted material discharge systems.
The necessary heat for effecting the pyrolysis stage can be produced internally, by burning the loaded material, whether it be complemented or not by burning the by-products of the pyrolysis (so-called combustion gas), or externally, by the heating in a furnace of a portion of the gas stream that is recirculated to the retort. However, in the processes that use the internal combustion (gas combustion) to generate the necessary heat for the pyrolysis stage, part of the products is burnt and the produced gas is contaminated with the by-products of the combustion.
As an example of the process by external heating there is the PetroSix, technology developed by Petrobras (Petróleo Brasileiro), with a processing capacity of 6,200 tonnes per day in an industrial retort that processes oil shale with a particle size between 10 mm and 70 mm and has a yield around 85% in oil on the standard Fischer assay. Furthermore, the PetroSix retorting process uses a system of dry sealing on top and a hydraulic sealing at the bottom (spent shale exit from the reactor) which results in significant water consumption in the process and, as a result, brings major difficulties in applying this process in regions with poor water availability. Additionally, in the PetroSix process, all the required heat for the retorting is provided by a furnace, external to the reactor (retort), in the form of hot recycle. Due to the low recovery of heat from the spent shale, the energy efficiency of the retorting process of PetroSix is impaired.
Another retorting process called Keviter process, a technology developed by an Estonian company, Viru Keemia, has the processing capacity of 1,000 tonnes per day, operating oil shale with a particle size from 10 to 125 mm. In this process, the load supply, the gravity flow and the sealing are very similar to the PetroSix process, including the use of sealing with water at the bottom of the retort; however, the required heat for the oil shale pyrolysis is provided by two rectangular combustors located in the middle of the cylindrical reactor, characterizing it as a gas combustion process. In these combustors, process gases are injected and the combustion of these gases provides the necessary heat for the oil shale pyrolysis. The oil vapors and the gas produced in the pyrolysis, along with the combustion gases, are removed by two collectors on the retort upper side. Part of the process gas is injected into the retort bottom to recover the spent shale heat which descends by gravity from the pyrolysis zone. The spent shale is not burnt and contains organic matter residues; the gas resulting from the process is poor, contaminated with nitrogen and carbon dioxide. The oil yield in the Keviter retorting process is 75% on the standard Fischer assay.
The retorting process Fuschun Generator Type (gas combustion), technology developed in China, has been used for over 70 years. Its processing capacity is small, 100 tonnes per day, operating with oil shale particles in the range of 10 to 75 mm. The oil yield is 65% on the standard Fischer assay.
The Fushun retort presents a stricture in the middle of the reactor which separates the retort into two parts, the upper portion, where the oil shale is pyrolyzed, and the lower portion, where the spent shale is burnt.
At the bottom of the pyrolysis zone a hot recycle, preheated in an external furnace, is injected to complement the necessary heat for the pyrolysis of the oil shale. The produced gas has poor quality, contaminated by nitrogen and carbon dioxide, which limits reuse. In addition to this, the process yield is greatly reduced because part of the oil is burnt inside of the reactor (retort). This is considered to be a small capacity process and poses major environmental issues.
There is also the Paraho process, which works with indirect heat, similar to Petrosix process, distinguished only by its equipment/device's features. This process was tested on a semi-industrial scale and after a testing period, the activities were discontinued.
Other retorting processes which use granulated material, for instance, the Union process (oil shale supply through the bottom of the retort and removal through the top of the retort) and RedLeaf (large volumes deposited on the surface and enveloped), are also known by experts in the subject.
Regarding patents that describe technologies for the extraction of hydrocarbons from pyro-bituminous oil shale, several documents can be found, but each of them describes completely distinct processes and equipment when compared to the present invention, which is original and offers a wide range of advantages over the prior art.
The US patent application US 2009/0050532 describes a shale oil extraction technology (SOT—Shale Oil Technology) which has a vertical retort with gravity-based outflowing and sealing by rotating valves, as well as distribution of the material by inclined septa (flow interference) of internal combustion.
The American patent U.S. Pat. No. 4,151,047 provides an apparatus for the supply of pyro-bituminous oil shale into a series of retorts, where each retort is equipped with a rotational distribution spout and a central supply channel, such retort being radially arranged from a distribution oil shale central tower. At least one hopper communicates with a central supply channel, linking it to the retort and being laterally displaced in relation to the retort longitudinal axis. Furthermore, conveyor belts are provided to transfer the oil shale from the central distribution tower to the hoppers of each retort.
The Brazilian patent PI 8606369, held by Petrobras—Petróleo Brasileiro SA and expired in Dec. 22, 2001, deals with the improvement in the equipment and in the process to obtain oil, gas and by-products from pyro-bituminous oil shale and other hydrocarbons impregnated materials. This patent describes a retorting process, called PetroSix, which uses a retort containing (a) a rotational top sealing system consisting of two apparatus in series with rotating vanes to transport the material horizontally from one apparatus to the other, (b) an anti-segregation mechanism composed by a rotor that distributes the material in a single point, (c) hot gases injection device comprised by six ducts of irregular hexagon shape, transversal to the bed held in shell sockets diametrically opposed, (d) a discharging device consisting of concentric annular steel plates, disposed at a predetermined distance from each other, there being deflectors over the gaps between the steel plates in the shape of inverted V that prevent the free flow of material, (e) a retorting vessel that operates with a continuous moving bed in a complete circular section from the top of the bed to the annular steel plates of the discharge mechanism and (f) a removing and bottom sealing device comprising an inclined flight conveyor filled with water which effects the sealing.
The American patent U.S. Pat. No. 3,519,539 relates to an oil shale retorting process conducted through a vertical retort, where the gas recycle is used to cool down the spent shale in a cooling zone, air is mixed with gas recycle and the mixture burns in an internal combustion zone (gas combustion) above the cooling zone.
The American patent U.S. Pat. No. 4,029,220 refers to an apparatus to load the particulate material into a container that contains rotational load distribution facilities to distribute the loaded particulate material in the retort, which means that the load distributor can provide greater uniformity on the distribution of various particles sizes and can also provide and maintain a production line with the desired profile and in the container height. The distribution facility includes a hopper with a plurality of chutes rigidly fixed, extending downwards with lower discharging portions that discharge in concentric circular zones in the production line. The distribution facility includes a segmented portion at the hopper junction and the chutes which divide the material from the discharged load into the hopper in the proportion of the circular zone in the production line, which is supplied by the chute. The distribution facility operates completely filled with the supplied material (full capacity) to provide particulate mass flow through the chutes and to avoid the segregation among the larger and smaller particles of the loaded material, deposited on the bed level.
The American patent U.S. Pat. No. 5,041,210 relates to an oil shale retorting process on a vertical retort, where the gas recycle containing the produced steam and gas is separated from the exhaustion gas of the retort and is used to heat the oil shale. Steam exists in a quantity (in volume) of gas recycle of at least 40% and, preferably 70%. The minimum particle size of pyro-bituminous oil shale is so that the particles are retained on a screen with openings of ¼ inch. The maximum particle size is so that the particles are capable of passing through a screen with openings of 3 inches.
Given the challenges of the prior art, as above summarized, the applicant of this patent request has developed a surface vertical retort (100) with an external heating source and a process to obtain oil and gas from pyro-bituminous oil shale and/or materials which contain organic compounds, performed by the operation of the mentioned retort (100).
the multifunctional central pipe (110).
the top sealing device (120).
the load distribution system (130).
the retorting vessel (140).
the plenum chamber (150).
the device for heat recovery of the spent material (160).
the device for dry bottom sealing (170).
The present invention relates to a surface vertical shaft retort (100), heated by an external source, which includes (i) a multifunctional central pipe (110), (ii) a top sealing device (120), (iii) a load distribution system (130), (iv) a retorting vessel (140) containing an annular-shaped bed (141) furnished with a set of load pipes (142), spaced among themselves, forming a collecting chamber to gather gas and mist (143), a hot gas injector (144), a cold recycle collector (145) and distributor (146) and a bed control and unloading mechanism (147), (v) a plenun chamber (150) (vi) a device for heat recovery of the spent shale (160) containing a piping network (162) for recirculation and spraying of the retorting water and accumulation hoppers (161) and (vii) a device for dry bottom sealing (170). In addition, this patent application comprises a process to obtain oil and gas from pyro-bituminous oil shale and/or materials which contain organic compounds using the referred surface vertical retort (100) heated by an external source through the following steps (a) load supply, (b) sealing of the load supply, (c) load distribution, (d) collection and removal of gases and mist, (e) heating and drying of the load, (f) reinjection of gas stream from the cold-gas recycle from stage (i), (g) load pyrolysis, (h) injection of the hot-gas recycle stream, (i) removal of the cold-gas recycle stream, (j) heat recovery of the spent material, (k) discharge of the annular-shaped bed, (l) cold-gas recycle injection (m) mixture of the cold recycle stream with the water vapor stream, (n) collection in the accumulation hoppers of discharged spent material, (o) spraying of the recycled retorting water, (p) vapor generation by the contact of the recycled retorting water with the retorted material deposited in the accumulation hoppers and (q) dry discharge of the spent shale, and bottom sealing.
In one particular embodiment, the invention refers to an externally heated surface vertical shaft retort (100) of large capacity, particularly about 5,000 to 10,000 metric tonnes per operation day, consisting of:
In an alternate embodiment, this patent application also reflects a process to obtain oil and gas from pyro-bituminous oil shale and/or materials containing organic compounds through the use of a vertical retort (100), being the process to obtain oil and gas performed through the following steps:
The used materials and loads in the process to obtain oil and gas can be oil shale, its derivatives and/or materials which contain organic compounds.
The technology described by the present invention, the retort, its devices and the process to obtain oil and gas provide a series of mechanical and processes innovations which increase the energy recovery contained in the ore and eliminates the need of an external water supply in the retort.
The retorting process, called PRIX, took place inside the surface vertical shaft retort (100) of the invention and comprised the steps of heating the ore to a temperature of approximately 500° C., by an externally heated gas stream, producing gas, oil and water vapor. The heat supplied by the gas stream with temperatures around 480° C. is composed by the processing gas and is distributed along the transversal section of the retort through radial and circumferential injectors. The gas flowed in a counter flow direction to the oil shale and drained by gravity. Simultaneously to the heating, the gas promoted the removal of the products generated by the pyrolysis of the oil shale. The larger portion of the cold stream injected in the plenum chamber (150) along with the steam generated in the cooling system of the spent shale, partially heated, was captured by the stream separation system before reaching the height where the hot gas injector is located and deviated to the bed part situated above the hot gas injector.
Subsequent to the generation and removal of the products, the oil shale, now called spent shale (retorted), flowed to the lower part of the retort. At the bottom part of the spent shale bed, a gas stream at low temperature was injected in order to cool the spent shale down, while recovering part of the heat contained in the spent shale.
In a region below the injection of hot gas stream, a stream of gas at low temperature which was injected into the bottom of the bed, now already heated by the heat recovered from spent shale, was removed from the bed by a collector device.
The gas stream then passed through a dust collector device, which removed most of the dust dragged out of the retort.
After the dust removal, the gas was reintroduced into the upper bed by a distribution device. At this point it was mixed with the effluent gas from the pyrolysis region and flowed to the top of the bed, providing heat for drying and heating of the raw oil shale that flowed in counterflow.
Reaching the top of the bed, the gas stream was collected in a chamber where it was removed for external processing by nozzles in the retort shell. After passing through the pyrolysis zone, the descending mass of spent shale passed by the collector of cold-gas recycle and came in contact with the ascendant gas stream at low temperature, warming it and resulting in the progressive reduction of its temperature until it reaches the bed control and movement mechanism. The flowing of the oil shale bed in the process was adjusted by the bed control and movement mechanism which, through a shuttle movement of the scrapers located on the radial tables, made the homogeneous transfer of the retorted material bed, to the bottom of the retort.
The spent shale, cooled by the gas stream at low temperature, passed through the control and movement mechanism and was deposited into hoppers, where it received an additional cooling provided by a spray of water which, vaporized, was mixed with the gas stream at low temperature.
When sufficiently cooled for future handling and transportation by solids transport equipment, the spent shale was removed and forwarded to the external environment by the dry discharge system and bottom sealing.
Throughout the process above described, the following conditions were essential to maximize the oil recovery and the thermal efficiency in the processing:
uniform distribution of particles in the oil shale bed throughout all retort sections, providing homogeneous flow of the gas stream;
the bed density remains slightly thickened during the course of the load from the top to its discharge, ensuring good permeability for the gas stream flow without causing excessive head loss;
uniform discharge in every point, moving the oil shale bed at the same speed throughout the cross section, ensuring that each oil shale layer has the same process conditions;
cooling the hot gas containing the generated oil, by the oil shale that flows in countercurrent, being so fast as to provide conditions for the super saturation of the gas, essential for the formation of mist; and
retention of the mist formed by the bed, that is reinforced by the water vapor generation in the retort bottom with the recycle of retorting water.
The top sealing system (120) of the invention aimed at the continuous loading of oil shale load with an intermediate particle size, ranging from 5 mm to 100 mm, in a reactor containing gases, whether toxic or not, mainly: hydrogen sulphide, carbon monoxide and hydrocarbons.
The load system was formed by alternating batches between two hoppers. However, both the load reaching the system and its flow to the inside of the retort were made continuously.
Each of these hoppers was equipped with sealing valves, one in the entrance nozzle and another in the exit nozzle, and received, alternatively and continuously, the oil shale load, previously prepared.
A device inserted into the load transfer chute to the hoppers alternates, along the cycles, the oil shale flow from one or another hopper. The hopper that receives the load has the top valve open and the bottom closed. On the other hand, the other hopper necessarily has the top valve closed and the bottom open, allowing the oil shale to be transferred to the inside of the load bin with controlled flow by the flow metering system. When the discharge ends, the control system detects the event and commands a new round, by inverting the function of each hopper, i.e., from load to unload and vice versa.
The sealing was performed so as to avoid the output of gases to the atmosphere or the inlet of air to the bin, during the transfer of the load into the retort, by the controlled injection of inert gas into the hopper. The hopper which received the load was then closed, completing a cycle. A control system supervised the operations.
Over the hoppers is located the flow switcher device, to which the hoppers were connected, always in pairs and installed side by side. The particulate material, whose flow was released by the bottom valve of one of the hoppers, passed through the pipe and rested on the table that prevents its free passage. The ratio among the diameter of the table, the pipe diameter and the distance between the edge of the pipe and the table were previously defined. The spin of the rotor produced a dosed flow of material to the load distribution system.
The rotational hopper, with circular sectors previously dimensioned, received the load, evenly discharged throughout the periphery of the flow metering system's table of the top sealing device. Each circular sector of the rotational hopper presented a particular capacity, proportional to the area of the annulus which was supplied. Each of the tubular chutes discharged in a specific area of an annulus above the trunk conical septa. The lower end of each tubular chute has a turning radius properly positioned to discharge into a defined annulus.
The septa in trunk conical shape were sufficient to cover the entire bin area defined by the material bed formed between the multifunctional central pipe and the bin shell. Furthermore, a level control assured that the deposited material below the end of the chutes would not have contact with the chutes themselves, eliminating the possibility of jam.
The separation of cold recycle from hot recycle was made by the use of a circular multifunctional central pipe whose axis coincide with the retort axis. In a bed height, just below the injection of hot recycle, where the cold recycle was already sufficiently warmed, there is a collector formed by metallic radial beams in format and layout adequate to the collection of cold recycle stream.
The collector beams are connected to the multifunctional central pipe, so that the gases collected through the openings pass to the inside of the multifunctional central pipe. When moving towards the multifunctional central pipe, the dust, dragged by the gas stream, was removed by the device designed for its removal.
Passed the pyrolysis bed, the cold recycle stream, returned via graded pipes for the heating bed of raw oil shale through a distributor physically similar to the collector already mentioned. The passing of the cold recycle directly from the bottom bed to the top bed avoided all technical inconveniences of the mixture of cold recycle stream with hot recycle stream in the pyrolysis zone. Optionally, the deviation can be performed by ducts external to the retort shell.
In the cooling system of the spent shale, the retort has interconnected hoppers that receive the spent shale coming from the bed control and movement mechanism which, besides having transferred the spent shale, has also distributed the material among the hoppers in each cycle of the operation. The hoppers have irregular trunk-conical shape that interconnects in their upper part.
Each hopper has in its upper part a network of pipes equipped with water sprinkles.
The recycled retorting water that came into contact with the spent shale promoted its cooling and generated water vapor. The water vapor stream ascended in the existing free space between the top of the hoppers and the discharge mechanism (plenum chamber), mixed to the gas stream of the cold recycle and ascended through the spent shale bed up to the cold recycle collector.
The discharge of the oil shale consisted in removing the solid particles already processed, with no escape of gases and/or vapors contained in its interior while preventing the entrance of air.
The bottom sealing system aimed to continuously discharge the particles, sized in the range up to 100 mm, while maintaining the sealing of the retort. Each of the nozzles ending on the hoppers was provided with two valves separated by a duct (neck), both with sealing function. Above the upper valve, in the interior of each hopper, a flow metering system device kept the hopper full on its control level and, with this valve in open position and the lower valve closed, continuously discharged, at regular flow, the material from the hopper to the duct (neck) between the valves. When the duct reached its maximum level, the upper valve closed and the lower valve opened.
The valves of the bottom sealing system operated in programmed mode, i.e., the entire sequence of operations was commanded by a controller.
Number | Date | Country | Kind |
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102012009128.3 | Apr 2012 | BR | national |
Filing Document | Filing Date | Country | Kind |
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PCT/BR2013/000100 | 3/27/2013 | WO | 00 |